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ff7b988 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | import math
import tempfile
from scipy.io.wavfile import write as wavwrite
from .utils import run_cmd_sync
def madmom(sr, audio, beats_per_bar=None, beats_per_minute_hint=None):
if beats_per_minute_hint is not None and beats_per_minute_hint < 0:
raise ValueError()
# Run madmom
with tempfile.NamedTemporaryFile(suffix=".wav") as f:
wavwrite(f.name, sr, audio)
beats_per_bar_arg = ""
if beats_per_bar is not None:
if isinstance(beats_per_bar, list):
beats_per_bar_str = ",".join([str(b) for b in beats_per_bar])
else:
beats_per_bar_str = str(beats_per_bar)
beats_per_bar_arg = f"--beats_per_bar {beats_per_bar_str}"
beats_per_minute_arg = ""
if beats_per_minute_hint is not None:
min_bpm = beats_per_minute_hint * math.pow(2, -0.5)
max_bpm = beats_per_minute_hint * math.pow(2, 0.5)
beats_per_minute_arg = f"--min_bpm {min_bpm} --max_bpm {max_bpm}"
result, stdout, stderr = run_cmd_sync(
f"DBNDownBeatTracker {beats_per_bar_arg} {beats_per_minute_arg} single {f.name}"
)
if result != 0:
raise Exception(stderr)
# Parse output
dbts = []
bts = []
for l in stdout.splitlines():
t, p = l.split()
t = float(t)
if int(p) == 1:
dbts.append(t)
else:
bts.append(t)
# Make sure 100Hz and convert to discrete
assert all(abs(t - (round(t * 100) / 100)) < 1e-8 for t in bts + dbts)
dbts = [round(t * 100) for t in dbts]
bts = [round(t * 100) for t in bts]
# Sanity check (assumptions about madmom output)
assert all(t >= 0 for t in dbts + bts)
assert sorted(dbts) == dbts
assert sorted(bts) == bts
assert len(set(dbts)) == len(dbts)
assert len(set(bts)) == len(bts)
assert len(set(dbts).intersection(set(bts))) == 0
# Detect beats per bar
# NOTE: This logic asserts that madmom does *not* change the time signature
first_downbeat = None
detected_beats_per_bar = None
merged = sorted(dbts + bts)
if len(dbts) > 0:
first_downbeat = merged.index(dbts[0])
partial_head = [t for t in bts if t < dbts[0]]
partial_tail = [t for t in bts if t > dbts[-1]]
detected_beats_per_bar = None
for i in range(len(dbts) - 1):
beats_this_bar = 1
beats_this_bar += len([t for t in bts if t > dbts[i] and t < dbts[i + 1]])
if detected_beats_per_bar is None:
detected_beats_per_bar = beats_this_bar
assert beats_this_bar == detected_beats_per_bar
assert (
detected_beats_per_bar is None or len(partial_head) < detected_beats_per_bar
)
assert (
detected_beats_per_bar is None or len(partial_tail) < detected_beats_per_bar
)
if beats_per_bar is not None and detected_beats_per_bar is not None:
if isinstance(beats_per_bar, list):
assert detected_beats_per_bar in beats_per_bar
else:
assert detected_beats_per_bar == beats_per_bar
return first_downbeat, detected_beats_per_bar, [t / 100 for t in merged]
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